title: Predicting mortality in hospitalized patients with 2009 H1N1 influenza pneumonia.
abstract: BACKGROUND
  Community-acquired pneumonia (CAP) severity scores can identify patients at low risk for mortality who may be suitable for ambulatory care. Here, we follow the clinical course of hospitalized patients with CAP due to 2009 H1N1 influenza.
  
  
  OBJECTIVE
  To evaluate the role of CAP severity scores as predictors of mortality.
  
  
  METHODS
  This was a secondary data analysis of patients hospitalized with CAP due to 2009 H1N1 influenza confirmed by reverse transcriptase polymerase chain reaction enrolled in the CAPO (Community-Acquired Pneumonia Organization) international cohort study. CAP severity scores PSI (Pneumonia Severity Index), CURB-65 (confusion, urea, respiratory rate, blood pressure, age ≥ 65 years) and CRB-65 (confusion, respiratory rate, blood pressure, age ≥ 65 years) were calculated. Actual and predicted mortality rates were compared. A total of 37 predictor variables were evaluated to define those associated with mortality.
  
  
  RESULTS
  Data from 250 patients with CAP due to 2009 H1N1 influenza were analyzed. Patients with low predicted mortality rates (0-1.5%) had actual mortality rates ranging from 2.6% to 17.5%. Obesity and wheezing were the only novel variables associated with mortality.
  
  
  CONCLUSIONS
  The decision to hospitalize a patient with CAP due to 2009 H1N1 influenza should not be based on current CAP severity scores, as they underestimate mortality rates in a significant number of patients. Patients with obesity or wheezing should be considered at an increased risk for mortality.
authors.affiliation: Puerto Montt Hospital, Puerto Montt, Chile.
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mesh_terms: D000328:Adult; D000368:Aged; D015331:Cohort Studies; D017714:Community-Acquired Infections / Q000401:mortality* / Q000503:physiopathology / Q000821:virology; D005260:Female; D005544:Forecasting; D006760:Hospitalization; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000302:isolation & purification*; D007251:Influenza, Human / Q000150:complications / Q000401:mortality* / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000150:complications; D011024:Pneumonia, Viral / Q000401:mortality* / Q000503:physiopathology / Q000821:virology; D012135:Respiratory Sounds / Q000503:physiopathology; D012307:Risk Factors; D012720:Severity of Illness Index